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Finding the Fourth Proportional to 1,857.43, 2,785.20 and 980.40

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Solution

The fourth proportional to 1,857.43, 2,785.20 and 980.40 is: 1,470.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.43 : 2,785.20 = 980.40 : x
  2. Step 2: Convert to fraction form
    1,857.43/2,785.20 = 980.40/x
  3. Step 3: Cross multiply
    1,857.43x = 2,785.20 × 980.40
  4. Step 4: Simplify right side
    1,857.43x = 2,730,616.85
  5. Step 5: Solve for x
    x = 2,730,616.85/1,857.43
  6. Step 6: Final answer
    x = 1,470.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.